Apparatus and method for supporting asymmetric carrier aggregation in wireless communication system

ABSTRACT

An apparatus and a method for transmitting feedback information of an asymmetric frequency band in a wireless communication system supporting multiple bands are provided. The feedback information transmission method includes, when at least two frequency bands used by a mobile station includes at least one asymmetric frequency band, confirming feedback channel information for the asymmetric frequency band based on system channel information of the asymmetric frequency band, and transmitting feedback information for the asymmetric frequency band over the confirmed feedback channel. The feedback channel information includes feedback channel information for the asymmetric frequency band allocated to a symmetric frequency band.

PRIORITY

The present application claims the benefit under 35 U.S.C. §119(a) to aKorean patent application filed in the Korean Intellectual PropertyOffice on Feb. 23, 2010, and assigned Serial No. 10-2010-0016042, theentire disclosure of which is hereby incorporated by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a wireless communication system usingmultiple bands. More particularly, the present invention relates to anapparatus and a method for supporting data transmission and reception ofa mobile station using an asymmetric band in a wireless communicationsystem which utilizes multiple bands.

2. Description of the Related Art

As wireless communication systems advance, service type expansion andhigh service quality are increasingly being demanded. As a result, abroadband wireless communication system has been introduced.

The broadband wireless communication system utilizes a limited frequencyband. Accordingly, to provide broadband services, the broadband wirelesscommunication system utilizes an available resource in the limitedfrequency band. For example, in a wireless communication system based onthe Institute of Electrical and Electronics Engineers (IEEE) 802.16standard, a Base Station (BS) manages at least one Frequency Assignment(FA). The BS provides the wireless communication service to a MobileStation (MS) over its managed FA.

FIGS. 1A and 1B depict a configuration according to a number offrequency bands supported in a wireless communication system accordingto the related art.

FIG. 1A depicts an MS receiving a wireless communication service usingone FA at a time, and FIG. 1B depicts an MS receiving the wirelesscommunication service using two FAs at a time.

Referring to FIG. 1A, the MS 100 can migrate from an FA1 zone 120 to anFA2 zone 140. Herein, the FA1 zone 120 indicates a service coverage areausing the FA1 and the FA2 zone 140 indicates a service coverage areausing the FA2. For example, when the MS 100 travels in the FA1 zone 120,the MS 100 operates only one FA (e.g., FA1). When the FA1 and the FA2are managed by different BSs, the MS 100 may use the wirelesscommunication service using the FA2 after handover between the FAs.

Referring to FIG. 1B, it is assumed that the MS 150 can use at least twoFAs. The MS 150 can receive the wireless communication service usingboth of the FA1 zone 160 and the FA2 zone 180. When the MS and the BStransmit and receive signals over the multiple FAs as above, the MS andthe BS can transmit and receive high-capacity data at a high data rate.

When the MS uses a plurality of the FAs at the same time, the FAs usedby the MS can be configured asymmetrically as shown in FIGS. 2A, 2B and2C.

FIGS. 2A, 2B and 2C depict asymmetric frequency band configuration in awireless communication system supporting multiple bands according to therelated art.

Referring to FIG. 2A, the FA1 201 is used to transmit UpLink (UL) data,the FA2 203 is used to transmit DownLink (DL) data, and the FA3 205 isused to transmit UL data and DL data. That is, the FA1 201 and the FA2203 indicate the FAs supporting a Frequency Division Duplex (FDD)structure, and the FA3 205 indicates the FA supporting a Time DivisionDuplex (TDD) structure. When the FA2 203 and the FA3 205 are allocatedto the MS 150, the MS 150 has an asymmetric carrier aggregation and thusa DL signal is received using DL regions of the FA2 203 and the FA3 205and a UL signal is transmitted using a UL region of the FA3 205.

Referring to FIG. 2B, the FA1 211, the FA2 213, and the FA3 215 are usedto transmit UL data and DL data. Namely, the FA1 211, the FA2 213, andthe FA3 215 indicate FAs supporting the TDD structure.

When the DL region of the FA1 211 and the FA2 213 are allocated to theMS 150, the MS 150 has the asymmetric carrier aggregation and thus a DLsignal is received using the DL regions of the FA1 211 and the FA2 213and a UL signal is received using the UL region of the FA2 213.

Referring to FIG. 2C, the FA1 221 is used to transmit DL data, the FA2223 is used to transmit UL data and DL data, and the FA3 225 is used totransmit UL data. That is, the FA1 221 and the FA3 225 indicate FAssupporting the FDD structure, and the FA2 223 indicates an FA supportingthe TDD structure.

When the FA1 221, the DL region of the FA2 223, and the FA3 225 areallocated to the MS 150, the MS has the asymmetric carrier aggregationand thus a DL signal is received using the FA1 221 and the DL region ofthe FA2 223 and a UL signal is received using the FA3 225.

The BS in the wireless communication system allocates a resource to theMS to provide the wireless communication service using channel feedbackinformation received from the MS. However, in the asymmetric carrieraggregation, there can be no UL channel symmetrical to the DL channel.In this regard, what is needed is a separate method for transmitting thechannel feedback information between the BS and the MS in the asymmetriccarrier aggregation.

SUMMARY OF THE INVENTION

An aspect of the present invention is to address at least theabove-mentioned problems and/or disadvantages and to provide at leastthe advantages described below. Accordingly, an aspect of the presentinvention is to provide an apparatus and a method for communicatingusing multiple frequency bands between a mobile station and a basestation in a wireless communication system.

Another aspect of the present invention is to provide an apparatus and amethod for communicating between a mobile station and a base stationusing an asymmetric frequency band in a wireless communication system.

A further aspect of the present invention is to provide an apparatus anda method for transmitting channel feedback when data is transmitted andreceived using an asymmetric frequency band in a wireless communicationsystem.

Yet another aspect of the present invention is to provide an apparatusand a method of a base station for allocating a channel feedbackresource of an asymmetric S-FA when data is transmitted and receivedusing an asymmetric frequency band in a wireless communication system.

Yet still another aspect of the present invention is to provide anapparatus and a method of a mobile station for transmitting channelfeedback of an asymmetric S-FA when data is transmitted and receivedusing an asymmetric frequency band in a wireless communication system.

In accordance with an aspect of the present invention, a method fortransmitting feedback information of an asymmetric frequency band at aMobile Station (MS) in a wireless communication system which supportsmultiple bands is provided. The method includes when at least twofrequency bands used by the MS include at least one asymmetric frequencyband, confirming feedback channel information for the asymmetricfrequency band based on system channel information of the asymmetricfrequency band, and transmitting feedback information for the asymmetricfrequency band over the confirmed feedback channel. The feedback channelinformation includes feedback channel information for the asymmetricfrequency band allocated to a symmetric frequency band.

In accordance with another aspect of the present invention, an apparatusfor transmitting feedback information of an asymmetric frequency band atan MS in a wireless communication system which supports multiple bandsis provided. The apparatus includes a receiver for, when at least twofrequency bands used by the MS include at least one asymmetric frequencyband, confirming feedback channel information for the asymmetricfrequency band based on system channel information received over theasymmetric frequency band, and a transmitter for transmitting feedbackinformation for the asymmetric frequency band over the confirmedfeedback channel. The feedback channel information includes feedbackchannel information for the asymmetric frequency band allocated to asymmetric frequency band.

In accordance with yet another aspect of the present invention, a methodfor transmitting feedback channel information of an asymmetric frequencyband at a Base Station (BS) in a wireless communication system whichsupports multiple bands is provided. The method includes when at leasttwo frequency bands used by an MS include at least one asymmetricfrequency band, transmitting feedback channel information for theasymmetric frequency band using system channel information of theasymmetric frequency band, and receiving feedback for the asymmetricfrequency band over a feedback channel allocated to the asymmetricfrequency band. The feedback channel information includes feedbackchannel information for the asymmetric frequency band allocated to asymmetric frequency band.

In accordance with still another aspect of the present invention, anapparatus for transmitting feedback channel information of an asymmetricfrequency band at a BS in a wireless communication system which supportsmultiple bands is provided. The apparatus includes a transmitter for,when at least two frequency bands used by a Mobile Station (MS) includeat least one asymmetric frequency band, transmitting feedback channelinformation for the asymmetric frequency band using system channelinformation of the asymmetric frequency band, and a receiver forreceiving feedback for the asymmetric frequency band over a feedbackchannel allocated to the asymmetric frequency band. The feedback channelinformation includes feedback channel information for the asymmetricfrequency band allocated to a symmetric frequency band.

Other aspects, advantages, and salient features of the invention willbecome apparent to those skilled in the art from the following detaileddescription, which, taken in conjunction with the annexed drawings,discloses exemplary embodiments of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects, features, and advantages of certainexemplary embodiments of the present invention will be more apparentfrom the following description taken in conjunction with theaccompanying drawings, in which:

FIGS. 1A and 1B illustrate configuration according to the number offrequency bands supported in a wireless communication system accordingto the related art;

FIGS. 2A, 2B and 2C illustrate asymmetric frequency band configurationin a wireless communication system supporting multiple bands accordingto the related art;

FIG. 3 illustrates a frame for transmitting feedback of an asymmetricfrequency band in a wireless communication system according to anexemplary embodiment of the present invention;

FIG. 4 illustrates a frame for transmitting feedback of an asymmetricfrequency band in a wireless communication system according to anexemplary embodiment of the present invention;

FIG. 5 illustrates a method for processing feedback of an asymmetricfrequency band at a mobile station in a wireless communication systemaccording to an exemplary embodiment of the present invention;

FIG. 6 illustrates a method for processing feedback of an asymmetricfrequency band at a base station in a wireless communication systemaccording to an exemplary embodiment of the present invention;

FIG. 7 illustrates a frame for transmitting feedback of an asymmetricfrequency band in a wireless communication system according to anexemplary embodiment of the present invention;

FIG. 8 illustrates a method for processing feedback of an asymmetricfrequency band at a mobile station in a wireless communication systemaccording to an exemplary embodiment of the present invention;

FIG. 9 illustrates a method for processing feedback of an asymmetricfrequency band at a base station in a wireless communication systemaccording to an exemplary embodiment of the present invention;

FIG. 10 illustrates a structure of a mobile station for supporting anasymmetric frequency band in a wireless communication system accordingto an exemplary embodiment of the present invention; and

FIG. 11 illustrates a structure of a base station for supporting anasymmetric frequency band in a wireless communication system accordingto an exemplary embodiment of the present invention.

Throughout the drawings, like reference numerals will be understood torefer to like parts, components and structures.

DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

The following description with reference to the accompanying drawings isprovided to assist in a comprehensive understanding of exemplaryembodiments of the present invention as defined by the claims and theirequivalents. It includes various specific details to assist in thatunderstanding but these are to be regarded as merely exemplary.Accordingly, those of ordinary skill in the art will recognize thatvarious changes and modifications of the embodiments described hereincan be made without departing from the scope and spirit of theinvention. In addition, descriptions of well-known functions andconstructions may be omitted for clarity and conciseness.

The terms and words used in the following description and claims are notlimited to the bibliographical meanings, but, are merely used by theinventor to enable a clear and consistent understanding of theinvention. Accordingly, it should be apparent to those skilled in theart that the following description of exemplary embodiments of thepresent invention is provided for illustration purpose only and not forthe purpose of limiting the invention as defined by the appended claimsand their equivalents.

It is to be understood that the singular forms “a,” “an,” and “the”include plural referents unless the context clearly dictates otherwise.Thus, for example, reference to “a component surface” includes referenceto one or more of such surfaces.

By the term “substantially” it is meant that the recited characteristic,parameter, or value need not be achieved exactly, but that deviations orvariations, including for example, tolerances, measurement error,measurement accuracy limitations and other factors known to those ofskill in the art, may occur in amounts that do not preclude the effectthe characteristic was intended to provide.

FIGS. 3 through 11, discussed below, and the various exemplaryembodiments used to describe the principles of the present disclosure inthis patent document are by way of illustration only and should not beconstrued in any way that would limit the scope of the disclosure. Thoseskilled in the art will understand that the principles of the presentdisclosure may be implemented in any suitably arranged communicationssystem. The terms used to describe various embodiments are exemplary. Itshould be understood that these are provided to merely aid theunderstanding of the description, and that their use and definitions inno way limit the scope of the invention. Terms first, second, and thelike are used to differentiate between objects having the sameterminology and are in no way intended to represent a chronologicalorder, unless where explicitly state otherwise. A set is defined as anon-empty set including at least one element.

Exemplary embodiments of the present invention provide a technique fortransmitting feedback information when data is transmitted and receivedusing an asymmetric frequency band in a wireless communication systemwhich utilizes multiple bands.

Hereinafter, Orthogonal Frequency Division Multiplexing(OFDM)/Orthogonal Frequency Division Multiple Access (OFDMA) wirelesscommunication system is exemplified. Note that the present invention isequally applicable to other wireless communication systems.

Hereafter, a mode of a Mobile Station (MS) and a Base Station (BS) fortransmitting and receiving signals over a plurality of frequency bandsis referred to as an overlay mode. A wireless communication system inthe overlay mode is referred to as an overlay wireless communicationsystem.

In the overlay mode using an asymmetric Secondary Frequency Assignment(S-FA) as shown in FIGS. 2A, 2B and 2C, the MS needs to provide feedbackwith respect to the asymmetric S-FA, in addition to a primary band. TheBS should indicate resources of the Primary-FA (P-FA) used to transmitthe feedback of the asymmetric S-FA. For example, using the asymmetriccarrier aggregation of FIG. 2A, the BS should indicate resources of theP-FA used to transmit the feedback of the asymmetric FA2 203. The MStransmits the feedback of the asymmetric FA2 203 to the BS according tothe instruction of the BS.

Now, a frame for the MS to transmit the feedback for the asymmetric S-FAis explained.

FIG. 3 illustrates a frame for transmitting feedback of an asymmetricfrequency band in a wireless communication system according to anexemplary embodiment of the present invention.

Referring to FIG. 3, a P-FA1 300 may include a DownLink (DL) region 320and an UpLink (UL) region 330. A S-FA 310 includes a DL region 350. Thatis, the P-FA1 300 is configured in a Time Division Duplex (TDD) manner.

The DL region 320 of the P-FA1 300 includes a Super Frame Header (SFH)321, DL resource allocation MAP information (DL assignment A-MAPInformation Element (IE)) 323, UL resource allocation MAP information(UL assignment A-MAP IE) 325, fast feedback allocation MAP information(fast feedback allocation A-MAP IE) 327, and feedback poling MAPinformation (feedback polling A-MAP IE) 329. Herein, the fast feedbackallocation MAP information 327 and the feedback polling MAP information329, which are described to ease the understanding of exemplaryembodiments of the present invention, may not be contained in the DLregion 320 of the P-FA1 300.

The DL region 350 of the S-FA 310 may include an SFH 351, DL resourceallocation MAP information 353, fast feedback allocation MAP information355, and feedback polling MAP information 357. Herein, the fast feedbackallocation MAP information 355 and the feedback polling MAP information357, which are described to ease the understanding of exemplaryembodiments of the present invention, may not be contained in the DLregion 350 of the S-FA 310.

The UL region 330 of the P-FA1 300 includes feedback channel 331 for theDL of the P-FA1 300 (Distributed Logical Resource Units (DLRUs) forfeedback channels of primary carrier), Band Request (BR) channel 333 ofthe P-FA1 300 (BR channel of primary carrier), feedback channel 335 forDL of the S-FA 310 (DLRUs for feedback channels of secondary carrier),data channel 337 of the P-FA1 300 (data channel for primary carrier),data channel 339 for transmitting fast feedback information of the P-FA1300 (data channel (Media Access Control (MAC) control message) forprimary carrier), and data channel 341 for transmitting fast feedbackinformation of the S-FA 310 (data channel (MAC control message) forsecondary carrier).

In such a frame, the DL feedback channel information 331 of the P-FA1300 is transmitted through the SFH 321 of the P-FA1 300 as shown by thearrow 1, and the DL feedback channel information 335 of the S-FA 351 istransmitted through the SFH 351 of the S-FA 310 as shown by the arrow 2.The data channel information 339 for transmitting the fast feedbackinformation of the P-FA1 300 is transmitted through the feedback pollingMAP information 329 of the P-FA1 300 as shown by the arrow 3, and thedata channel information 341 for transmitting the fast feedbackinformation of the S-FA 310 is transmitted through the feedback pollingMAP information 357 of the S-FA 310 as shown by the arrow 4. Forexample, the feedback channel information transmitted using the SFHs 321and 351 includes the information of Table 1.

TABLE 1 Field Notes Number of UL ACKnowledgement (ACK)/ The Number ofHARQ Non-ACKnowledgement (NACK) feedback channels channels per HybridAutomatic Repeat Request (HARQ) feedback region Number of DLRUs for ULfeedback The Number of UL channel per a UL Advanced Air Interfacefeedback channels (AAI) subframe

In Table 1, the SFHs 321 and 351 include entire feedback channel regioninformation (number of DLRUs for UL feedback channel per a UL AAIsubframe), and HARQ feedback transmission channel region information(number of UL ACK/NACK channels per HARQ feedback region) in thefeedback channel region. For example, the SFH 321 of the P-FA1 300includes the entire feedback channel region information of the P-FA1300, and the HARQ feedback transmission channel region information ofthe feedback channel region. For example, the SFH 351 of the S-FA 310includes the entire feedback channel region information of the S-FA 310,and the HARQ feedback transmission channel region information of thefeedback channel region. Herein, the entire feedback channel regionincludes information combining the HARQ feedback transmission channelregion and the fast feedback channel region. Accordingly, the MS canobtain the fast feedback channel region information using the entirefeedback channel region information and the HARQ feedback transmissionchannel region information. The feedback channel region 335 for the S-FA310 follows the BR channel 333. Hence, the SFH 351 of the S-FA 310 doesnot need to contain start information of the feedback channel region 335for the S-FA 310.

When a plurality of MSs supports a Carrier Aggregation (CA) mode of theoverlay mode, the P-FA of each MS can be defined differently. Thus, theP-FA of a particular MS can be the S-FA of another MS.

Alternatively, the P-FAs of the MSs supporting the overlay mode can bedefined differently and their S-FAs can be set to the same FA. In thiscase, the S-FA can be an asymmetric band including only the DL, such asFA2 203 of FIG. 2A.

Alternatively, the P-FAs of the MSs supporting the overlay mode can beset to the same FA and their S-FAs can be defined differently. At thistime, the S-FA can be an asymmetric band including only the DL, such asFA2 203 of FIG. 2A.

When the MSs operating in the overlay mode share the S-FA and utilizethe different P-FAs as stated above, a frame for transmitting thefeedback for the asymmetric S-FA can be configured as shown in FIG. 4.For example, the frame of FIG. 4 can be used as well when the MSs sharethe P-FA and utilize different S-FAs.

FIG. 4 illustrates a frame for transmitting feedback of an asymmetricfrequency band in a wireless communication system according to anexemplary embodiment of the present invention.

Referring to FIG. 4, a P-FA1 400 includes a DL region 430 and a ULregion 440, an S-FA 410 includes a DL region 460, and a P-FA2 420includes a DL region 470 and a UL region 480. That is, the P-FA1 400 andthe P-FA2 420 are configured in the TDD manner.

The DL region 430 of the P-FA1 400 may include an SFH 431, DL resourceallocation MAP information 433, UL resource allocation MAP information435, fast feedback allocation MAP information 437, and feedback pollingMAP information 439. Herein, the fast feedback allocation MAPinformation 437 and feedback polling MAP information 439, which aredescribed to ease the understanding of exemplary embodiments of thepresent invention, may not be contained in the DL region 430 of theP-FA1 400.

The UL region 440 of the P-FA1 400 may include a feedback channel 441for the DL of the P-FA1 400, a BR channel 443 of the P-FA1 400, afeedback channel 445 for the DL of the S-FA 410, a data channel 447 ofthe P-FA1 400, a data channel 449 for transmitting fast feedbackinformation of the P-FA1 400, and a data channel 451 for transmittingfast feedback information of the S-FA 410. Herein, the feedback channel445 and the data channel 449 for transmitting the fast feedbackinformation of the P-FA1 400 utilize the P-FA1 400 and the S-FA 410, andincludes information corresponding to the MS operating in the overlaymode.

The DL region 470 of the P-FA2 420 may include an SFH 471, DL resourceallocation MAP information 473, UL resource allocation MAP information475, fast feedback allocation MAP information 477, and feedback pollingMAP information 479. Herein, the fast feedback allocation MAPinformation 477 and the feedback polling MAP information 479, which aredescribed to ease the understanding of exemplary embodiments of thepresent invention, may not be contained in the DL region 470 of theP-FA2 420.

The UL region 480 of the P-FA2 420 includes a feedback channel 481 forthe DL of the P-FA2 420, a BR channel 483 of the P-FA2 420, a feedbackchannel 485 for the DL of the S-FA 410, a data channel 487 of the P-FA2420, a data channel 489 for transmitting fast feedback information ofthe P-FA2 420, and a data channel 491 for transmitting fast feedbackinformation of the S-FA 410. Herein, the feedback channel 485 and thedata channel 489 for transmitting the fast feedback information of theP-FA2 420 utilize the P-FA2 420 and the S-FA 410, and includesinformation corresponding to the MS operating in the overlay mode.

The DL region 460 of the S-FA 410 may include an SFH 461, DL resourceallocation MAP information 463, fast feedback allocation MAP information465, and feedback polling MAP information 467. Herein, the fast feedbackallocation MAP information 465 and the feedback polling MAP information467, which are described to ease the understanding of the presentinvention, may not be contained in the DL region 460 of the S-FA 410.

In this frame, the DL feedback channel information 441 of the P-FA1 400is transmitted through the SFH 431 of the P-FA1 400 as shown by thearrow 1, and the DL feedback channel information 445 of the S-FA 410 istransmitted through the SFH 461 of the S-FA 410 as shown by the arrow 3.The data channel information 449 for transmitting the fast feedbackinformation of the P-FA1 400 is transmitted through the feedback pollingMAP information 439 of the P-FA1 400 as shown by the arrow 2, and thedata channel information 451 for transmitting the fast feedbackinformation of the S-FA 410 is transmitted through the feedback pollingMAP information 467 of the S-FA 410 as shown by the arrow 4.

The feedback channel information transmitted through the SFH 431 of theP-FA1 400 includes the information of Table 1.

The DL feedback channel information 481 of the P-FA2 420 is transmittedthrough the SFH 471 of the P-FA2 420 as shown by the arrow 5, and the DLfeedback channel information 485 of the S-FA 410 is transmitted throughthe SFH 461 of the S-FA 410 as shown by the arrow 7. The data channelinformation 489 for transmitting the fast feedback information of theP-FA2 420 is transmitted through the feedback polling MAP information479 of the P-FA2 420 as shown by the arrow 6, and the data channelinformation 491 for transmitting the fast feedback information of theS-FA 410 is transmitted through the feedback polling MAP information 467of the S-FA 410 as shown by the arrow 8.

The feedback channel information transmitted using the SFH 471 of theP-FA2 420 includes the information of Table 1.

To carry information relating to the feedback channel 445 using the P-FA1 400 and the feedback channel 485 using the P-FA2 420, the SFH 461 ofthe S-FA 410 includes information of Table 2.

TABLE 2 Field Notes Number of feedback channel info The number of feed-back channel in- formation for the secondary carrier For(i=0; i<Numberof feedback channel info; i++){ Carrier index carrier index for primarycarrier Number of UL ACK/NACK channels per The Number of HARQ HARQfeedback region feedback channels Number of DLRUs for UL feedbackchannel The number of UL per a UL AAI subframe feedback channels Thestart LRUs index for feedback channel The start position of feedbackchannel }

In Table 2, the SFH 461 of the asymmetric S-FA 410 includes a carrierindex for the P-FA of the MSs which use the asymmetric S-FA 410, entirefeedback channel region information (number of DLRUs for UL feedbackchannel per a UL AAI subframe) for the S-FA 410 of the MSs allocated ineach P-FA, and HARQ feedback transmission channel region information(number of UL ACK/NACK channels for HARQ feedback region) of thefeedback channel region. Herein, the entire feedback channel regionincludes information combining the HARQ feedback transmission channelregion and the fast feedback channel region. Accordingly, the MS canobtain the fast feedback channel region information using the entirefeedback channel region information and the HARQ feedback transmissionchannel region information.

The SFH 461 of the S-FA 410 in Table 2 can include feedback channelregion start (the start LRUs index for feedback channel) information.The feedback channel region start information informs where the feedbackchannel region for the S-FA 410 starts from. However, when the feedbackchannel region follows the BR channel 443 and 483, the SFH 461 does notneed to contain the feedback channel region start information.

The following explanations describe a method of the MS for processingthe feedback of the asymmetric S-FA using the frame of FIG. 3 or FIG. 4.

FIG. 5 illustrates a method for processing feedback of an asymmetricfrequency band at an MS in a wireless communication system according toan exemplary embodiment of the present invention.

The MS, which is communicating with the BS using the P-FA, determineswhether to enter the CA mode of the overlay mode in step 501.

If the MF determines not to enter the CA mode at step 501, the MSfinishes this process.

If the MS determines to enter the CA mode at step 501, the MS transmitsits multiple frequency support capability (multicarrier capability)information to the BS in step 503. Herein, the multiple frequencysupport capability information may include frequency bands supportableby the MS, the number of the frequency bands operable by the MSconcurrently, and guard subcarrier support.

In step 505, the MS receives information of the S-FA to use in the CAmode, from the BS.

In step 507, the MS receives activation indication information for theS-FA from the BS. For example, the MS receives from the BS, theactivation indication information for the UL/DL of the S-FA or theactivation indication information for the DL.

In step 509, the MS transmits and receives data to and from the BS inthe CA mode using the S-FA activated as instructed by the BS and theP-FA.

When transmitting and receiving data in the CA mode, the MS determineswhether the S-FA is the asymmetric frequency band in step 511. Forexample, the MS determines whether the S-FA is the asymmetric frequencyband using characteristic information of the frequency band contained inat least one of a global carrier configuration (AAI_Global-Config)message, a multiple frequency band information (AAI_MC-ADV) message, anda neighbor BS information (AAI_NBR-ADV) message which are received fromthe BS. Based on symmetric frequency band (fully configuredcarrier)/asymmetric frequency band (partially configured carrier)information of the frequency band characteristics, the MS determineswhether the S-FA is the asymmetric frequency band. Alternatively, the MSmay determine whether the S-FA is the asymmetric frequency band, usingthe activation indication information for the S-FA received from the BSin step 507. That is, when the BS instructs to activate only the DL ofthe S-FA, the MS recognizes that the S-FA is the asymmetric frequencyband.

When the MS determines that the S-FA is the asymmetric frequency band atstep 511, the MS obtains the feedback channel information for theasymmetric S-FA, from the SFH of the S-FA in step 513. For example,referring back to FIG. 3, the MS obtains the feedback channelinformation 335 for the DL of the S-FA 310, from the SFH 351 of the S-FA310. The MS obtains the information of the data channel information 341for transmitting the fast feedback information of the S-FA 310 from thefeedback polling MAP information 357 of the S-FA 310. Using the P-FA 1400 of FIG. 4, the MS may obtain the feedback channel information 445for the DL of the S-FA 410 from the SFH 461 of the S-FA 410. The MS mayobtain the information of the data channel 451 for transmitting the fastfeedback information of the S-FA 410 from the feedback polling MAPinformation 467 of the S-FA 410.

In step 515, the MS confirms the feedback channel region of the S-FAallocated to the UL region of the P-FA, using the feedback channelinformation of the S-FA. Next, the MS transmits the feedback of the S-FAover the confirmed feedback channel region of the S-FA. For example, inFIG. 3, the MS transmits the feedback of the P-FA over the feedbackchannel 331 of the P-FA 300 and transmits the feedback of the S-FA overthe feedback channel 335 of the S-FA 310.

When the MS determines that the S-FA is not the asymmetric frequencyband at step 511, the MS obtains the feedback channel information of thesymmetric S-FA, from the SFH of the S-FA in step 517.

In step 519, the MS confirms the feedback channel region of the S-FAallocated in the UL region of the S-FA. Next, the MS transmits thefeedback of the S-FA over the confirmed feedback channel region of theS-FA.

Next, the MS finishes this process.

FIG. 6 illustrates a method for processing feedback of an asymmetricfrequency band at a BS in a wireless communication system according toan exemplary embodiment of the present invention.

Referring to step 601, the BS determines whether the serviced MSsinclude the MS operating in the CA mode.

When the BS determines that there is no MS operating in the CA mode atstep 601, the BS finishes this process.

When the BS determines that there is an MS operating in the CA mode atstep 601, the BS determines whether there is an MS using the asymmetricS-FA in step 603.

When the BS determines that there is an MS using the asymmetric S-FA,the BS transmits the feedback channel allocation information of the P-FAand the feedback channel allocation information for the asymmetric S-FAusing the SFH of the P-FA and the SFH of the S-FA in step 605. Forexample, in FIG. 3, the BS transmits the feedback channel information331 for the DL of the P-FA 300 using the SFH 321 of the P-FA 300. The BSalso transmits the feedback channel information 335 for the DL of theS-FA 310 using the SFH 351 of the S-FA 310. The BS may transmit theinformation of the data channel 341 for transmitting the fast feedbackinformation of the S-FA 310 using the feedback polling MAP information357 of the S-FA. For instance, when the MS uses the P-FA1 400 in FIG. 4,the BS transmits the feedback channel information 441 for the DL of theP-FA1 400 using the SFH 431 of the P-FA1 400. The BS transmits thefeedback channel 445 information for the DL of the S-FA 410 using theSFH 461 of the S-FA 410. In so doing, the BS may transmit theinformation of the data channel 451 for transmitting the fast feedbackinformation of the S-FA 410 using the feedback polling MAP information467 of the S-FA 410.

In step 607, the BS receives the feedback for the P-FA and theasymmetric S-FA over the feedback channel allocated in the UL region ofthe P-FA according to the feedback channel allocation information sentover the SFHs of the P-FA and the S-FA.

Meanwhile, when the BS determines that there is no MS using theasymmetric S-FA at step 603, the BS transmits the feedback channelallocation information of the symmetric S-FA using the SFH of the S-FAin step 609. The BS transmits the feedback channel allocationinformation of the P-FA using the SFH of the symmetric P-FA.

In step 611, the BS receives the feedback of the P-FA over the feedbackchannel allocated in the P-FA according to the feedback channelallocation information sent over the SFH of the P-FA. The BS alsoreceives the feedback of the S-FA over the feedback channel allocated inthe S-FA according to the feedback channel allocation information sentover the SFH of the symmetric S-FA.

Next, the BS finishes this process.

In this exemplary embodiment, the BS transmits the feedback informationof the asymmetric frequency band to the MS using the SFH.

Alternatively, the BS may transmit the feedback information of theasymmetric frequency band to the MS using a system channel information(AAI_SCD) message. A frame for the MS to transmit the feedback for theasymmetric S-FA can be constituted as shown in FIG. 7.

FIG. 7 illustrates a frame for transmitting feedback of an asymmetricfrequency band in a wireless communication system according to anexemplary embodiment of the present invention.

Referring to FIG. 7, the P-FA1 700 includes a DL region 720 and a ULregion 730 and the S-FA 710 includes a DL region 750. That is, the P-FA1700 is configured in the TDD manner.

The DL region 720 of the P-FA1 700 may include an SFH 721, DL resourceallocation MAP information 723, UL resource allocation MAP information725, fast feedback allocation MAP information 727, and feedback pollingMAP information 729. Herein, the fast feedback allocation MAPinformation 727 and feedback polling MAP information 729, which aredescribed to ease the understanding of exemplary embodiments of thepresent invention, may not be contained in the DL region 720 of theP-FA1 700.

The DL region 750 of the S-FA 710 may include an SFH 751, DL resourceallocation MAP information 753, fast feedback allocation MAP information755, feedback polling MAP information 757, and system channelinformation (AAI_SCD) 759. Herein, the fast feedback allocation MAPinformation 755 and the feedback polling MAP information 757, which aredescribed to ease the understanding of an exemplary embodiment of thepresent invention, may not be contained in the DL region 750 of the S-FA710.

The UL region 730 of the P-FA1 700 may include a feedback channel 731for the DL of the P-FA1 700, a BR channel 733 of the P-FA1 700, afeedback channel 735 for the DL of the S-FA 710, a data channel 737 ofthe P-FA1 700, a data channel 739 for transmitting fast feedbackinformation of the P-FA1 700, and a data channel 741 for transmittingfast feedback information of the S-FA 110.

In this frame, the DL feedback channel information 731 of the P-FA1 700is transmitted through the SFH 721 of the P-FA1 700 as shown by thearrow 1, and the DL feedback channel information 735 of the S-FA 710 istransmitted through the system channel information 759 of the S-FA 710as shown by the arrow 3. The data channel information 739 fortransmitting the fast feedback information of the P-FA1 700 istransmitted through the feedback polling MAP information 729 of the P-FA1 700 as shown by the arrow 2, and the data channel information 741 fortransmitting the fast feedback information of the S-FA 710 istransmitted through the feedback polling MAP information 757 of the S-FA710 as shown by the arrow 4. For example, the system channel information759 includes the information of Table 1 or Table 2.

Now, a method of the MS for processing the feedback of the asymmetricS-FA using the frame of FIG. 7 is elucidated.

FIG. 8 illustrates a method of an MS for processing feedback of anasymmetric frequency band in a wireless communication system accordingto an exemplary embodiment of the present invention.

The MS which is communicating with the BS over the P-FA determineswhether to enter the CA mode of the overlay mode in step 801.

If the MS determines not to enter the CA mode at step 801, the MSfinishes this process.

However, if the MS determines to enter the CA mode at step 801, the MStransmits its multiple frequency support capability information to theBS in step 803. Herein, the multiple frequency support capabilityinformation includes frequency bands supportable by the MS, the numberof the frequency bands operable by the MS concurrently, and guardsubcarrier support.

In step 805, the MS receives information of the S-FA to use in the CAmode, from the BS.

In step 807, the MS receives activation indication information for theS-FA from the BS. For example, the MS receives from the BS, theactivation indication information for the UL/DL of the S-FA or theactivation indication information for the DL.

In step 809, the MS transmits and receives data to and from the BS inthe CA mode using the S-FA activated as instructed by the BS and theP-FA.

When transmitting and receiving data in the CA mode, the MS determineswhether the S-FA is the asymmetric frequency band in step 811. Forexample, the MS determines whether the S-FA is the asymmetric frequencyband using characteristic information of the frequency band contained inat least one of the global carrier configuration (AAI_Global-Config)message, the multiple frequency band information (AAI_MC-ADV) message,and the neighbor BS information (AAI_NBR-ADV) message which are receivedfrom the BS. Based on the symmetric frequency band (fully configuredcarrier)/asymmetric frequency band (partially configured carrier)information of the frequency band characteristics, the MS determineswhether the S-FA is the asymmetric frequency band. Alternatively, the MSmay determine whether the S-FA is the asymmetric frequency band, usingthe activation indication information for the S-FA received from the BSin step 807. That is, when the BS instructs to activate only the DL ofthe S-FA, the MS recognizes that the S-FA is the asymmetric frequencyband.

When the MS determines that the S-FA is the asymmetric frequency band atstep 811, the MS obtains the feedback channel information for theasymmetric S-FA, from the system channel information (AAI_SCD) of theS-FA in step 813. For example, referring back to FIG. 7, the MS obtainsthe feedback channel information 735 for the DL of the S-FA 710, fromthe system channel information 759 of the S-FA 710. The MS may obtainthe information of the data channel 741 for transmitting the fastfeedback information of the S-FA 710, from the feedback polling MAPinformation 757 of the S-FA 710.

In step 815, the MS confirms the feedback channel region of the S-FAallocated to the UL region of the P-FA, using the feedback channelinformation of the S-FA. Next, the MS transmits the feedback of the S-FAover the confirmed feedback channel region of the S-FA. For example, inFIG. 7, the MS transmits the feedback of the P-FA over the feedbackchannel 731 of the P-FA 700 and transmits the feedback of the S-FA overthe feedback channel 735 of the S-FA 700.

Meanwhile, when the MS determines that the S-FA is not the asymmetricfrequency band at step 811, the MS obtains the feedback channelinformation of the S-FA, from the SFH of the S-FA in step 817.

In step 819, the MS confirms the feedback channel region of the S-FAallocated in the UL region of the S-FA. Next, the MS transmits thefeedback of the S-FA over the confirmed feedback channel region of theS-FA.

Next, the MS finishes this process.

FIG. 9 illustrates a method of a BS for processing feedback of anasymmetric frequency band in a wireless communication system accordingto an exemplary embodiment of the present invention.

In step 901, the BS determines whether the serviced MSs include an MSoperating in the CA mode.

When the BS determines that there is no MS operating in the CA mode atstep 901, the BS finishes this process.

When the BS determines that there is an MS operating in the CA mode atstep 901, the BS determines whether there is an MS using the asymmetricS-FA in step 903.

When the BS determines that there is an MS using the asymmetric S-FA atstep 903, the BS transmits the feedback channel allocation informationof the P-FA and the feedback channel allocation information for the S-FAusing the SFH of the P-FA and the system channel information (AAI_SCD)of the S-FA in step 905. For example, in FIG. 7, the BS transmits thefeedback channel information 735 for the DL of the S-FA 710 using thesystem channel information (AAI_SCD) 759 of the S-FA 700. The BS maytransmit the information of the data channel 741 for transmitting thefast feedback information of the S-FA 710 using the feedback polling MAPinformation 757 of the S-FA 710.

In step 907, the BS receives the feedback for the P-FA and theasymmetric S-FA over the feedback channel allocated in the P-FAaccording to the feedback channel allocation information sent over theSFH of the P-FA and the system channel information of the S-FA.

Meanwhile, when the BS determines that there is no MS using theasymmetric S-FA at step 903, the BS transmits the feedback channelallocation information of the symmetric S-FA using the SFH of the S-FAin step 909. The BS transmits the feedback channel allocationinformation of the P-FA using the SFH of the symmetric P-FA.

In step 911, the BS receives the feedback of the P-FA over the feedbackchannel allocated in the P-FA according to the feedback channelallocation information sent over the SFH of the P-FA. The BS alsoreceives the feedback of the S-FA over the feedback channel allocated inthe S-FA according to the feedback channel allocation information sentover the SFH of the symmetric S-FA.

Next, the BS finishes this process.

FIG. 10 is a block diagram of an MS for supporting an asymmetricfrequency band in a wireless communication system according to anexemplary embodiment of the present invention.

The MS of FIG. 10 includes a duplexer 1000, a receiver 1002, a messageprocessor 1004, a controller 1010, a message generator 1022, and atransmitter 1024.

The duplexer 1000 passes a transmit signal output from the transmitter1024 to an antenna for transmission there from, and passes a receivesignal from the antenna to the receiver 1002 according to the duplexingscheme.

The receiver 1002 demodulates a Radio Frequency (RF) signal fed from theduplexer 1000 into a baseband signal. The receiver 1002 may include anRF processing block, a demodulating block, a channel decoding block, andso on, which are not shown for convenience in description. Herein, theRF processing block converts the RF signal output from the duplexer 1000into the baseband signal. The demodulating block may include a FastFourier Transform (FFT) operator for extracting data from subcarriers ofthe signal output from the RF processing block, which is not shown forconvenience in description. The channel decoding block may include ademodulator, a deinterleaver, and a channel decoder, which are not shownfor convenience in description.

Under the control of the controller 1010, the receiver 1002 changes areceive frequency band. For instance, when the MS does not support theoverlay mode, the receiver 1002 changes the receive frequency band tocover the P-FA under the control of the controller 1010. For example,when the MS supports the overlay mode, the receiver 1002 changes thereceive frequency band to cover the P-FA and at least one S-FA under thecontrol of the controller 1010.

The message processor 1004 extracts control information from the signaloutput from the receiver 1002 and provides the extracted information tothe controller 1010. That is, the message processor 1004 extracts thefeedback channel information, the S-FA allocation information, and theS-FA indication information from the signal output from the receiver1002, and provides the extracted information to the controller 1010. Forexample, when the asymmetric frequency band of FIG. 3 is used, themessage processor 1004 obtains the feedback channel information 335 forthe DL of the S-FA 310 from the SFH 351 of the S-FA 310. The messageprocessor 1004 obtains the data channel information 341 for transmittingthe fast feedback information of the S-FA 310 from the feedback pollingMAP information 357 of the S-FA 310. In another example, when theasymmetric frequency band of FIG. 7 is used, the message processor 1004obtains the feedback channel information 735 for the DL of the S-FA 710from the system channel information 759 of the S-FA 710. The messageprocessor 1004 obtains the data channel information 741 for transmittingthe fast feedback information of the S-FA 710 from the feedback pollingMAP information 757 of the S-FA 710. In the meantime, as for thesymmetric frequency band, the message processor 1004 obtains thefeedback channel information 735 for the DL of the S-FA 710 from the SFH751 of the S-FA 710.

The controller 1010 controls the operations and the overlay mode of theMS. The controller 1010 controls to execute the overlay mode using theS-FA allocation information received from a serving BS, at least oneS-FA activated by the S-FA indication information, and the P-FA.

According to whether the overlay mode is supported, the controller 1010controls the frequency bands of the receiver 1002 and the transmitter1024. For example, when the MS does not support the overlay mode, thecontroller 1010 controls to define the receive frequency band of thereceiver 1002 and the transmit frequency band of the transmitter 1024 tocover the P-FA. When the MS uses the multiple bands of FIG. 3, thecontroller 1010 controls to define the receive frequency band of thereceiver 1002 to cover the P-FA 300. The controller 1010 controls todefine the transmit frequency band of the transmitter 1024 to cover theP-FA 300 and the S-FA 310.

The controller 1010 determines whether to use the asymmetric frequencyband. For instance, the controller 1010 determines whether the S-FA isthe asymmetric frequency band using the characteristic information ofthe frequency band contained in at least one of the global carrierconfiguration (AAI_Global-Config) message, the multiple frequency bandinformation (AAI_MC-ADV) message, and the neighbor BS information(AAI_NBR-ADV) message which are received from the serving BS. Based onthe symmetric frequency band (fully configured carrier)/asymmetricfrequency band (partially configured carrier) information of thefrequency band characteristics, the controller 1010 examines whether theS-FA is the asymmetric frequency band. Alternatively, the controller1010 may determine whether the S-FA is the asymmetric frequency band,using the activation indication information for the S-FA received fromthe serving BS. That is, when the serving BS instructs to activate onlythe DL of the S-FA, the controller 1010 recognizes that the S-FA is theasymmetric frequency band.

When using the asymmetric frequency band, the controller 1010 controlsthe message processor 1004 to receive the feedback channel informationfor the asymmetric frequency band.

The message generator 1022 generates a control message to transmit tothe serving BS under the control of the controller 1010. For example,under the control of the controller 1010, the message generator 1022generates the control message including the multiple frequency supportcapability information of the MS. Herein, the multiple frequency supportcapability information includes the frequency bands supportable by theMS, the number of the frequency bands operable by the MS concurrently,and the guard subcarrier support. For example, the message generator1022 generates a feedback message of the P-FA and at least one S-FAunder the control of the controller 1010.

The transmitter 1024 encodes data to transmit to the serving BS and thecontrol message output from the message generator 1022, converts theminto an RF signal, and outputs the RF signal to the duplexer 1000. Forexample, when the asymmetric S-FA of FIG. 3 is used, the transmitter1024 transmits the feedback information of the P-FA and the S-FA overthe feedback channel 335 allocated in the UL of the P-FA 300 confirmedby the message processor 1004.

The transmitter 1024 may include a channel coding block, a modulatingblock, and an RF processing block, which are not shown for conveniencein description. Herein, the channel coding block may include amodulator, an interleaver, a channel encoder, and so on, which are notshown for convenience in description. The modulating block may includean Inverse FFT (IFFT) operator for mapping the signal output from thechannel coding block to subcarriers, which is not shown for conveniencein description. The RF processing block converts the baseband signaloutput from the modulating block into an RF signal and outputs the RFsignal to the duplexer 1000.

The transmitter 1024 alters the transmit frequency band under thecontrol of the controller 1010.

FIG. 11 is a block diagram of a BS for supporting an asymmetricfrequency band in a wireless communication system according to anexemplary embodiment of the present invention.

The BS of FIG. 11 includes a duplexer 1100, a receiver 1102, a messageprocessor 1104, a controller 1110, a CA controller 1112, a messagegenerator 1122, and a transmitter 1124.

The duplexer 1100 passes a transmit signal output from the transmitter1124 to an antenna for transmission there from, and passes a receivesignal from the antenna to the receiver 1102 according to the duplexingscheme.

The receiver 1102 demodulates an RF signal fed from the duplexer 1100into a baseband signal. The receiver 1102 may include an RF processingblock, a demodulating block, a channel decoding block, and so on, whichare not shown for convenience in description. Herein, the RF processingblock converts the RF signal output from the duplexer 1000 into thebaseband signal. The demodulating block may include an FFT operator forextracting data from subcarriers of the signal output from the RFprocessing block, which is not shown for convenience in description. Thechannel decoding block may include a demodulator, a deinterleaver, and achannel decoder, which are not shown for convenience in description.

Under the control of the controller 1110, the receiver 1102 changes areceive frequency band.

The message processor 1104 extracts control information from the signaloutput from the receiver 1102 and provides the extracted information tothe controller 1110.

The controller 1110 controls the operations of the serving BS and thetransmit and receive frequencies according to whether the overlay modeis supported. More specifically, based on whether the overlay mode issupported, the controller 1110 controls the frequency bands of thereceiver 1102 and the transmitter 1124. For example, when the servicedMS does not support the overlay mode, the controller 1110 control todefine the receive frequency band of the receiver 1102 and the transmitfrequency band of the transmitter 1124 to cover the P-FA. For example,when the serviced MS uses the multiple bands of FIG. 3, the controller1110 controls to define the receive frequency band of the receiver 1102to cover the P-FA 300 and the S-FA 310. The controller 1110 alsocontrols to define the transmit frequency band of the transmitter 1124to cover the P-FA 300.

The CA controller 1112 determines the S-FA of the MS based on themultiple frequency support capability information of the MS which cansupport the multiple bands. The CA controller 1112 determines the regionto activate in the S-FA allocated to the MS.

The message generator 1122 generates a control message to transmit tothe MS under the control of the controller 1110. For example, under thecontrol of the controller 1110, the message generator 1122 generates acontrol message including the S-FA information of the MS and a controlmessage including the S-FA activation indication information. Forexample, the message generator 1122 generates a control messageincluding the feedback channel information of the P-FA and the S-FA.When the asymmetric S-FA of FIG. 7 is used, the message generator 1122generates a message of the system channel information 759 of the S-FA710 to include the feedback channel information of the S-FA. When theasymmetric S-FA of FIG. 3 is used, the message generator 1122 generatesthe SFH 351 of the S-FA 310 to include the feedback channel informationof the S-FA.

The transmitter 1124 encodes the data to transmit to the MS and thecontrol message output from the message generator 1122, converts theminto an RF signal, and outputs the RF signal to the duplexer 1100. Thetransmitter 1124 may include a channel coding block, a modulating block,and an RF processing block, which are not shown for convenience indescription. Herein, the channel coding block includes a modulator, aninterleaver, a channel encoder, and so on, which are not shown forconvenience in description. The modulating block may include an IFFToperator for mapping the signal output from the channel coding block tosubcarriers, which is not shown for convenience in description. The RFprocessing block may convert the baseband signal output from themodulating block into an RF signal and output the RF signal to theduplexer 1100.

Under the control of the controller 1110, the transmitter 1124 altersits transmit frequency band. For example, when the serviced MS does notsupport the overlay mode, the transmitter 1124 changes the transmitfrequency band to cover the P-FA under the control of the controller1110. When the serviced MS supports the overlay mode, the transmitter1124 changes the transmit frequency band to cover the P-FA and at leastone S-FA under the control of the controller 1110.

The MS of FIG. 10 and the BS of FIG. 11 include the single transmitterand the single receiver. However, the MS and the BS may include two ormore transmitters and receivers for the P-FA and at least one S-FA.

In the exemplary embodiment of the present invention, the BS maytransmit the feedback channel information for the asymmetric S-FA to theMS using any one of the SFH and the system channel information (AAI_SCD)message.

Alternatively, the BS may transmit the entire feedback channel regioninformation (number of DLRUs for UL feedback channel per a UL AAIsubframe) of the feedback channel information for the S-FA and the HARQfeedback transmission channel region information (number of UL ACK/NACKchannels per HARQ feedback region) of the feedback channel region overthe SFH, and transmit the feedback channel region start (the start LRUsindex for feedback channel) through the system channel information(AAI_SCD) message.

In the exemplary embodiment of the present invention, the MS may fulfillthe multiple frequency band operation using one P-FA and one S-FA.However, the present invention is not limited thereto and is applicableto a case where the MS conducts the multiple frequency band operationusing at least one S-FA. When at least one S-FA includes the asymmetriccarrier aggregation, the BS may transmit the feedback channelinformation for each asymmetric S-FA using at least one of the SFH ofthe asymmetric S-FA and the system channel information (AAI_SCD).Herein, the feedback channel for the asymmetric S-FA may be allocated tothe P-FA of the MS.

In the exemplary embodiment of the present invention, the BS maytransmit the feedback channel information for the asymmetric S-FA to theMS through a broadcast signal of the SFH and the system channelinformation (AAI_SCD).

Alternatively, the BS may transmit the feedback channel information forthe S-FA to the MS through the activation indication information for theasymmetric S-FA. In this case, the feedback channel information mayinclude the information described in Table 1 or Table 2.

As set forth above, when the asymmetric frequency carrier aggregation isallocated to the MS in the wireless communication system, the MS maytransmit the channel feedback of the asymmetric S-FA using the P-FA.Therefore, the channel feedback of the asymmetric S-FA can betransmitted in the asymmetric frequency carrier aggregation.

Although the present disclosure has been described with an exemplaryembodiment, various changes and modifications may be suggested to oneskilled in the art. It is intended that the present disclosure encompasssuch changes and modifications as fall within the scope of the appendedclaims.

What is claimed is:
 1. An operating method for a Mobile Station (MS)operating in a Carrier Aggregation (CA) mode in a wireless communicationsystem, the method comprising: receiving system configurationinformation transmitted on at least one downlink (DL) only secondarycarrier partially configured as an asymmetric frequency band from a basestation (BS); and transmitting feedback information related to the atleast one secondary carrier through a feedback channel at a feedbackregion of a primary carrier configured as a symmetric frequency band tothe BS, wherein the feedback region is indicated in the systemconfiguration information.
 2. The method of claim 1, further comprising:when executing the CA mode, transmitting multiple frequency supportcapability information to the BS over the primary carrier; receiving atleast one information on the secondary carrier to use in the CA mode,from the BS; transmitting and receiving data to and from the BS usingthe primary carrier and a secondary carrier activated by the BS amongthe at least one secondary carrier; and when transmitting and receivingthe data to and from the BS, determining whether there exists anasymmetric frequency band, wherein, when the asymmetric frequency bandexists, the feedback region is obtained.
 3. The method of claim 2,wherein the multiple frequency support capability information comprisesinformation of at least one of frequency band supportable by the MS, thenumber of frequency bands operable by the MS concurrently, and whether aguard subcarrier is supported.
 4. The method of claim 2, wherein thedetermining of whether there exists the asymmetric frequency bandcomprises: determining whether an asymmetric frequency band is presentusing characteristic information of the frequency band contained in atleast one of a global carrier configuration message, a multiplefrequency band information message, and a neighbor BS informationmessage which are received from the BS.
 5. The method of claim 2,wherein the determining of whether there exists the asymmetric frequencyband comprises: determining whether an asymmetric frequency band ispresent using activation indication information for at least onesecondary frequency band received from the BS.
 6. The method of claim 1,wherein the feedback region is indicated using the system configurationinformation comprising at least one of: a physical carrier index for theprimary carrier; a start Distributed Logical Resource Unit (DLRU) indexfor feedback channel; the number of DLRUs for feedback channel; and thenumber of Hybrid Automatic Repeat reQuest (HARQ) feedback channel perHARQ feedback region.
 7. The method of claim 1, further comprising: whenthere is no asymmetric frequency band in at least two frequency bandsused by the MS, confirming information of a feedback channel for eachfrequency band based on a super frame header of each frequency band; andtransmitting feedback information for each frequency band over theconfirmed feedback channel.
 8. An apparatus for a Mobile Station (MS)operating in a Carrier Aggregation (CA) mode in a wireless communicationsystem, the apparatus comprising: a receiver configured to receivesystem configuration information transmitted on at least one downlink(DL) only secondary carrier partially configured as an asymmetricfrequency band from a base station (BS); and a transmitter configured totransmit feedback information related to the at least one secondarycarrier through a feedback channel at a feedback region of a primarycarrier configured as a symmetric frequency band to the BS, wherein thefeedback region is indicated in the system configuration information. 9.The apparatus of claim 8, further comprising a controller configured tocontrol the transmitter and the receiver to: when executing the CA mode,transmit multiple frequency support capability information to the BSover the primary carrier, receive at least one information on thesecondary carrier to use in the CA mode, from the BS, transmit andreceive data to and from the BS using the primary carrier and asecondary carrier activated by the BS among the at least one secondarycarrier, wherein the controller is configured to determine whether thereexists an asymmetric frequency band, and wherein, when the asymmetricfrequency band exists, the controller is configured to obtain thefeedback region.
 10. The apparatus of claim 9, wherein the multiplefrequency support capability information comprises information of atleast one of frequency band supportable by the MS, the number offrequency bands operable by the MS concurrently, and whether a guardsubcarrier is supported.
 11. The apparatus of claim 9, wherein thecontroller is configured to determine whether there is an asymmetricfrequency band using characteristic information of the frequency bandcontained in at least one of a global carrier configuration message, amultiple frequency band information message, and a neighbor BSinformation message which are received from the BS.
 12. The apparatus ofclaim 9, wherein the controller is configured to determine whether anasymmetric frequency band is present using activation indicationinformation for at least one secondary frequency band received from theBS.
 13. The apparatus of claim 8, wherein the feedback region isindicated using the system configuration information comprising at leastone of: a physical carrier index for the primary carrier; a startDistributed Logical Resource Unit (DLRU) index for feedback channel; anumber of DLRUs for feedback channel; and a number of Hybrid AutomaticRepeat Request (HARQ) feedback channels per HARQ feedback region. 14.The apparatus of claim 8, wherein, when there is no asymmetric frequencyband in at least two frequency bands used by the MS, a controller isconfigured to confirm information of a feedback channel for eachfrequency band based on a super frame header of each frequency band. 15.An operating method for a Base Station (BS) operating in a CarrierAggregation (CA) mode in a wireless communication system, the methodcomprising: transmitting system configuration information on at leastone downlink (DL) only secondary carrier partially configured as anasymmetric frequency band to a Mobile Station (MS); and receivingfeedback information related to the at least one secondary carrierthrough a feedback channel at a feedback region of a primary carrierconfigured as a symmetric frequency band from the MS, wherein thefeedback region is determined indicated in the system configurationinformation.
 16. The method of claim 15, further comprising: when the CAmode is executed, transmitting to the MS at least one information on thesecondary carrier to be used by the MS in the CA mode, determined byconsidering multiple frequency support capability information of the MSreceived over the primary carrier of the MS; transmitting activationindication information for the at least one secondary carrier to the MS;transmitting and receiving data to and from the MS using the secondarycarrier instructed to activate and the P-FA; and when transmitting andreceiving data to and from the MS, determining whether there exists anasymmetric frequency band among the frequency bands used by the MS,wherein, when the asymmetric frequency band is present among thefrequency bands used by the MS, feedback channel information for theasymmetric frequency band is transmitted.
 17. The method of claim 16,wherein the multiple frequency support capability information comprisesinformation of at least one of frequency band supportable by the MS, thenumber of frequency bands operable by the MS concurrently, and whether aguard subcarrier is supported.
 18. The method of claim 16, wherein thedetermining of whether there exists the asymmetric frequency bandcomprises: determining whether an asymmetric frequency band is presentusing the activation indication message sent to the MS.
 19. The methodof claim 15, wherein the feedback region is indicated using the systemconfiguration information comprising at least one of: a physical carrierindex for the primary carrier; a start Distributed Logical Resource Unit(DLRU) index for feedback channel; a number of DLRUs for feedbackchannel; and a number of Hybrid Automatic Repeat Request (HARQ) feedbackchannels per HARQ feedback region.
 20. The method of claim 15, furthercomprising: when there is no asymmetric frequency band among at leasttwo frequency bands used by the MS, transmitting information of afeedback channel for each frequency band using a super frame header ofeach frequency band; and receiving feedback information for eachfrequency band over the confirmed feedback channel.
 21. An apparatus fora Base Station (BS) operating in a Carrier Aggregation (CA) mode in awireless communication system, the apparatus comprising: a transmitterconfigured to transmit system configuration information on at least onedownlink (DL) only secondary carrier partially configured as anasymmetric frequency band to a Mobile Station (MS); and a receiverconfigured to receive feedback information related to the at least onesecondary carrier through a feedback channel at a feedback region of aprimary carrier configured as a symmetric frequency band from the MS,wherein the feedback region is determined indicated in the systemconfiguration information.
 22. The apparatus of claim 21, furthercomprising: a controller configured, when the CA mode is executed, todetermine at least one secondary carrier to be used by the MS in the CAmode and whether to activate each secondary carrier, based on multiplefrequency support capability information of the MS received over theprimary carrier of the MS, and to control to transmit and receive datato and from the MS using the at least one frequency band indicated toactivate, wherein, when the frequency bands used by the MS comprise theasymmetric frequency band, the controller is configured to control totransmit feedback channel information for the asymmetric frequency band.23. The apparatus of claim 22, wherein the multiple frequency supportcapability information comprises information of at least one offrequency band supportable by the MS, the number of frequency bandsoperable by the MS concurrently, and whether a guard subcarrier issupported.
 24. The apparatus of claim 22, wherein the controllerdetermines whether there is an asymmetric frequency band usingactivation indication information sent to the MS.
 25. The apparatus ofclaim 21, wherein the feedback region is indicated using the systeminformation comprising at least one of: a physical carrier index for theprimary carrier; a start Distributed Logical Resource Unit (DLRU) indexfor feedback channel; the number of DLRUs for feedback channel; and thenumber of Hybrid Automatic Repeat Request (HARQ) feedback channel perHARQ feedback region.
 26. The apparatus of claim 21, wherein, when theat least two frequency bands used by the MS comprise no asymmetricfrequency band, the transmitter is configured to transmit information ofa feedback channel for each frequency band using a super frame header ofeach frequency band.